Already added A record to GoDaddy still cannot get it works.

I purchased the domain name musicplaylistplayer.app a couple days ago. I installed discourse on my Droplet, went to GoDaddy added an A record with name “discourse” pointing to 138.68.12.139. Then I waited for a few days, it does not works. I then updated existing A record @ to point to 138.68.12.139 as well. But is the same.